Forcing Hazel to rematch files

Hi. I have a series of rules I use for photo management that I have been using successfully on many hundreds of files, though at most on 50 at a time. I recently dragged over 100 files to the watched folder, and the rules did not do anything on most of them. However, in Preview mode I can see that the rules ARE being matched. And in the console log I see entries such as:
2015-02-09 21:32:38.413 hazelworker[78154] DSCN1097.JPG: Rule Photo Management: If photo has exif data rename matched.
It seems like something happened to mess Hazel up, and now these files will no longer work within Hazel (new files DO work). Is there a way to make Hazel forget it examined these files so I can try again? Or is there something else I might be overlooking?
Thanks!
Michael
2015-02-09 21:32:38.413 hazelworker[78154] DSCN1097.JPG: Rule Photo Management: If photo has exif data rename matched.
It seems like something happened to mess Hazel up, and now these files will no longer work within Hazel (new files DO work). Is there a way to make Hazel forget it examined these files so I can try again? Or is there something else I might be overlooking?
Thanks!
Michael